Ni55 Nickel-Based Welding Wire
🌟 Product Overview
Ni55 (ERNiCrMo-3) is a premium nickel-based welding wire engineered for high-corrosion, medium-to-high temperature (≤650℃) applications. It excels in welding nickel-based alloys (e.g., Inconel 625) and dissimilar materials (stainless steel + nickel alloys), making it a core choice for critical equipment in:
Chemical engineering (acid/alkali pipelines, reactors)
Nuclear power (pressure vessels, heat exchangers)
Marine engineering (offshore platforms, seawater pipelines)
✨ Key Advantages
Superior Corrosion Resistance: Resists chloride ion corrosion and intergranular corrosion, ideal for harsh chemical environments.
High Temperature Stability: Maintains strength and toughness at temperatures up to 650℃.
Reliable Weld Quality: Low impurity content minimizes porosity and slag inclusion, ensuring consistent weld performance.
⚠️ Safety Protection (Non-Negotiable)
Prioritize personnel and on-site safety to avoid nickel fume exposure and arc hazards:
Environmental Safety
Equip with mechanical fume extractors (use "supply-exhaust combined" system for enclosed spaces; nickel fume concentration ≤0.5mg/m³).
Keep flammables (paint, alcohol) ≥5m away; prepare ABC dry powder fire extinguishers.
Personal Protection
Wear N95+ dust masks (prevents nickel fume allergies) and flame-retardant welding suits.
Use welding helmets with shade number ≥10 (avoids arc eye/skin burns).
Equipment Safety
Ensure welding machines are grounded (resistance ≤4Ω); test for stable current (no fluctuations/interruptions).
🛠️ Pre-Welding Preparation (Quality Foundation)
Ni55 is sensitive to impurities-follow these steps to avoid defects:
| Preparation Item | Requirements | Purpose |
|---|---|---|
| Base Material | 1. Clean groove + ≥20mm area: Remove rust with stainless steel wire brush → wipe oil/moisture with anhydrous ethanol/acetone. 2. Preheat thick plates (≥12mm) to 80-150℃ (infrared thermometer verification). |
Prevent porosity from oil/moisture; avoid cold cracks. |
| Welding Wire | 1. Inspect surface: No oxidation (polish slight pale yellow oxidation to silver-white with fine sandpaper). 2. Store in sealed moisture-proof cabinet (humidity ≤40%); dry at 250℃ for 1h if damp/stored >3 months. |
Ensure wire purity; reduce slag inclusion. |
| Equipment & Gas | 1. Use DC pulse TIG/MIG 焊机 (stable parameters). 2. Shielding gas: 99.99% high-purity argon (O₂ content ≤0.005%); pressure 0.4-0.6MPa (regulator required). |
Avoid weld oxidation; ensure stable welding. |
⚙️ Core Welding Parameters (Reference)
Adjust based on base material thickness-never exceed parameters (prevents coarse grains and reduced corrosion resistance):
| Welding Process | Wire Diameter (mm) | Current (A) | Voltage (V) | Speed (mm/min) | Argon Flow (L/min) | Application |
|---|---|---|---|---|---|---|
| TIG (Manual) | 1.6-2.4 | 80-150 | 10-14 | 50-80 | Front: 8-12; Back: 6-8 (for thick plates) | Thin-walled parts, precision joints (pipelines) |
| MIG | 1.2-1.6 | 180-250 | 18-22 | 100-150 | 15-20 | Thick plates, high-efficiency welding |
📌 Welding Operation Tips
Short Arc Control: Arc length ≤ wire diameter (e.g., ≤1.6mm for 1.6mm wire) to maintain gas shielding.
Weaving Limit: Weave amplitude ≤3× wire diameter (e.g., ≤6mm for 2.0mm wire) to avoid incomplete fusion.
Interpass Temperature: Keep ≤150℃ (real-time monitoring with infrared thermometer) to prevent weld embrittlement.
Backside Shielding: For pipelines/vessels, supply argon (6-8L/min) to weld backside to avoid oxidation.
🔍 Post-Welding Treatment
Slow Cooling: Cool to room temperature naturally (no direct water cooling); insulate high-constraint parts at 200-300℃ for 1-2h before cooling.
Surface Cleaning: Remove slag/spatter with stainless steel wire brush; pickle blackened oxide scale with 10-15% nitric acid (5-10min) → rinse + dry.
Quality Inspection:
Appearance: Smooth weld, no porosity/slag/cracks; reinforcement ≤3mm.
NDT: 100% qualification rate for UT (ultrasonic) or PT (penetrant) testing on critical parts.
❓ Common Issues & Solutions
| Defect | Cause | Solution |
|---|---|---|
| Weld Porosity | Oil/moisture on material; low-purity argon | Reclean material with acetone, dry wire; use 99.99% argon. |
| Slag Inclusion | Incomplete interpass slag removal; fast speed | Clean slag thoroughly; reduce welding speed. |
| Cold Cracks | No preheating; rapid cooling | Preheat to 80-150℃; insulate + slow cool. |
| Weld Blackening | Insufficient argon flow; long arc | Adjust flow, match nozzle size; control arc length. |
📢 Important Notes
Operators must hold nickel-based alloy welding certification (e.g., AWS CWI, special equipment welding license).
Record parameters, date, operator, and inspection results for traceability.
Consult our technical team for special conditions (low temperature, strong acid) to confirm process compatibility.
📞 Contact Us
For technical support or order inquiries, reach out to our team anytime-we're here to ensure your welding success!
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